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The fatigue and wear characteristics of four different steel wheel materials are investigated in detail by using rolling contact fatigue and wear bench tests on a JD-1 apparatus,analyzing chemical composition and hardness,and performing profile analysis and micro-morphology analysis.The wear and fatigue behavior of one of the materials under different operation speeds is also investigated.The results show that the wear resistance of the materials has a positive correlation with their carbon content,while fatigue resistance has a negative correlation.Based on hardness analysis as a function of depth into the specimen,the thickness of layers with a steep hardness gradient has a negative correlation with the initial surface hardness in the tests using different materials.The hardness increments,however,have a positive correlation with initial surface hardness.The rolling tests on one material using different rotation speeds show that the hardness increments and the thickness of layers with a steep hardness gradient increase with the rotation speed.The analyses and experimental results demonstrate that two of the four materials exhibit good wear resistance and rolling contact fatigue resistance,making them suitable for either highspeed or heavy axle railroad operations.
The fatigue and wear characteristics of four different steel wheel materials are investigated in detail by using rolling contact fatigue and wear bench tests on a JD-1 apparatus, analyzing chemical composition and hardness, and performing profile analysis and micro-morphology analysis. Wear and fatigue behavior of one of the materials under different operation speeds is also investigated. The results show that the wear resistance of the materials has a positive correlation with their carbon content, while fatigue resistance has a negative correlation. Based on hardness analysis as a function of depth into the specimen, the thickness of layers with a steep hardness gradient has the negative surface with the initial surface hardness in the tests using different materials. material using different rotation speeds show that the hardness increments and the thickness of layers wit h a steep hardness gradient increase with the rotation speed. the analyzes and experimental results demonstrate that two of the four materials exhibit good wear resistance and rolling contact fatigue resistance, making them suitable for either highspeed or heavy axle railroad operations.